Concrete floor.



UNITED STATES PATENT GEFICE.

. ERNEST LESLIE RANSOME, on NEW-YORK, ti. Y.

CONCRETE FLOOR.

SIEGIFIGATION forming art or Letters Patent no. 652,733, dated June 26,1900.

Application filed January 4, 1900. Serial No. 405. (No specimens.)

T at whom it may concern:

Be it known that I, ERNEST LESLIE RAN- SOME, a citizen of the UnitedStates, residing "Sim-as, for example, those built of plasterof-paris orsimilar substances capable of being thus molded.

In the construction of hollow floors having flat ceilings a modesometimes adopted is to mold the whole structure in one piece aboutcores, and because of the difficulties of removing these cores they aregenerally left within the floor. The usual practice, however, is tofirst construct the floor and subsequentlyto attach the. ceiling to thebeams of the floor. By my invention this process is reversed, for Ifirst mold the ceiling and the beams or webs of the floor, and afterthese parts have become sufficiently rigid to bear the molding of therest of the work without injury I mold the upper part of the floorthereto, as hereinafter described.

For convenience of description in this specification I divide the floorinto three principal parts-viz., the lower member, hereinafter calledthe ceiling, the central members, which connect the lower member to theupper member and which correspond to the webs of beams and which arehereinafter called the webs, and the top member, which forms thatportion of the floor which directly sustains the traffic and load andwhich is hereinafter called the top.

The accompanying drawing illustrates my invention, which is as follows:

Upon any suitable false work A the coreboxes B are placed. These boxesstand upon the short legs B, which are about as high as the requiredthickness of the ceiling. The boxes are placed in such relativepositions and sufficiently apart so that the spaces intervening conformto the shape of the required webs. After securing the core-boxes inplace by suitable' bracing G the ceiling D separately applied for.

and Webs E are molded about them after any of the ordinary ways inplaster, cement, or concrete, or any like substance, hereinafter calledconcrete. After the molded material has sufficiently hardened thecore-boxes are removed and the mold-plates F or G are placed and the topis then molded to the webs.

In order to make a good union between the webs and the top or betweenany other parts when required that have been molded at different times,I use, by preference, a metallic coil H, Letters Patent for which havebeen This coil is buried longitudinally for about half its diameter inthe top concrete of the web E, and the rest of it is embedded into thetop, as at K, when that portion is placed. Such a joint properly madebecomes fully as strong as the adjoining parts.

In place of the coil hard porous blocks L or M, made of clay, concrete,or other suitable material, may be used, in which case I prefer makingthem with recesses, as at M, for purposes hereinafter described.

Any other tie may be used instead of the coil or blocks if it will makea strong union at the joint.

The mold-plates F G may be of any suitable material and be supportedfrom the ceiling, as shown at N, or they may be supported from the webs,as shown at 0. They may be placed either upon recesses formed in theconcrete, asat P, or with the concrete and brick, as at L, or in thebrick, as at M, or upon the frames N, and they are either left in, or,in cases where the spaces are large enough, they are usually wedged upinto position and subsequently removed. In order the better to sustaintheir load,:they may be curved, as at G.

For convenience of holding the floor-strips when such are required thejoint blocks or webs may extend up to the under side of the strip, asshown at M, and the strip It may be clamped thereto temporarily orotherwise with clamps S. When the web itself is thus extended, Isometimes prefer setting therein at the time of molding nailing-blocksor like keys, by which the floor-strip can be attached to the web.

When it is desired, the ceiling may be molded and allowed to set beforethe webs are built, in which event the same care must be taken to makethe joints between the ceiling and webs as heretofore described inmaking the joints between the webs and the top. This modification,however, is not often desirable.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

l. The method of molding the floor in situ, consisting in supportingabove and upon a platform or false work, core-boxes suitably spacedapart, molding concrete or equivalent material under and about saidcore-boxes to form the ceiling and webs of the fioor, allowing theconcrete to set, removing the coreboxes and molding and firmly attachingthe top layer upon the webs, substantially as set forth.

2. The method of molding a floor in situ, consisting in first moldingthe ceiling and webs of concrete or equivalent material, and before theconcrete sets applying at the top of the webs suitable union-piecesadapted to make firm connection with the concrete, al.-

lowing the parts to set and then molding the 2 5 floor proper or topthereon, substantially as set forth.

3. The method of molding a floor in situ, consisting in molding it ofconcrete or equivlent material, in two or more distinct parts, 30

applying to the part first molded before it sets suitable union-piecesadapted to make firm connection with the concrete, allowing such part toset, and molding the top part or

